JP6941480B2 - Ceiling support structure - Google Patents

Description

The present invention relates to a ceiling support structure that supports a ceiling structure.

As the above-mentioned ceiling support structure, for example, there is a suspended ceiling structure shown in Patent Document 1. In this suspended ceiling structure, the field edge and the field edge receiver are arranged in a substantially grid pattern at the tip of the hanging bolt (ceiling suspension material) that is hung from the upper floor slab, which is an example of the skeleton, and is placed at the important points. The ceiling structure frame is suspended and supported.
In addition, since the ceiling structure frame suspended and supported only by hanging bolts sways like a pendulum in the event of an earthquake or the like, braces (diagonal members) are arranged in a brace shape across adjacent hanging bolts. ..

Japanese Unexamined Patent Publication No. 2008-050784

In the above-mentioned suspended ceiling structure, although the rigidity and proof stress in the horizontal direction are strengthened by arranging the braces across the hanging bolts, the horizontal deformation during an earthquake is still large due to the suspended ceiling structure. Therefore, in order to prevent the ceiling structure from falling, it is necessary to increase the clearance between the ceiling structure and the surrounding wall side, which is a weak point of the acoustic environment.

Further, in the above-mentioned suspended ceiling structure, in order to ensure sound insulation performance, anti-vibration measures are taken to provide an anti-vibration mechanism having anti-vibration rubber on each of all the suspension bolts arranged at key points. There is. In the case of a suspended ceiling structure provided with this anti-vibration mechanism, there is a problem that the ceiling structure is greatly deformed in the horizontal direction at the time of an earthquake, and vibration is propagated through the brace.

In view of this situation, the main subject of the present invention is to improve the acoustic environment by reducing the horizontal deformation of the ceiling structure during an earthquake while suppressing the vibration (sound) of the ceiling structure with the vibration isolation mechanism. The point is to provide a ceiling support structure that can be planned.

The first characteristic configuration according to the present invention is in a ceiling support structure in which a ceiling structure is supported by a support portion of a non-suspended structure that is coupled to the skeleton and behaves together with the skeleton.
A vibration-proof mechanism for transmitting a vertical load via a vibration-proof rubber is provided between the support portion and the ceiling structure, and the vibration-proof mechanism can be brought into contact with the vibration-proof rubber from the horizontal direction. A horizontal displacement stopper provided on the support side in the state is provided .
In the anti-vibration mechanism, the upper receiving material on the support portion side and the lower receiving material on the ceiling structure side are connected by a through bolt with the anti-vibration rubber interposed therebetween, and the top plate of the anti-vibration rubber and the said. A gap of the set interval is formed between the horizontal displacement stopper and the inner surface of the bolt insertion hole of the anti-vibration rubber in a state where the outer surface of the through bolt is in contact with the inner surface of the bolt insertion hole of the anti-vibration rubber. Within the range of the gap until the top plate comes into contact with the horizontal displacement stopper, the through bolt slides and moves in a vertical position to shear-deform the anti-vibration rubber, and the anti-vibration rubber. After the top plate comes into contact with the horizontal displacement stopper, the through bolt tilts to compress and deform the anti-vibration rubber, and the second rubber deformation operation is feasible .

According to the above configuration, the vertical load of the ceiling structure is transmitted to the support portion of the non-suspended structure that behaves together with the skeleton via the vibration-proof rubber of the vibration-proof mechanism, so that the vibration (sound) of the ceiling structure is transmitted. Can be suppressed from being propagated to the support portion side. Nevertheless, the horizontal force of the ceiling structure during an earthquake is transmitted to the support by the restoring force that accompanies the deformation of the anti-vibration rubber in the state of being in contact with the horizontal displacement stopper on the support side, thereby restoring the anti-vibration rubber. The horizontal rigidity and rotational rigidity due to the force can reduce the deformation of the ceiling structure in the horizontal direction during an earthquake. As a result, in a specific ceiling where vibration isolation and sound insulation performance are required, it is possible to reduce the clearance around the ceiling structure (wall side), which is a weak point of the acoustic environment.

According to the above configuration, in the first rubber deformation operation of the anti-vibration mechanism, the through bolt slides in the vertical position within the range of the gap formed between the top plate of the anti-vibration rubber and the horizontal displacement stopper. The anti-vibration rubber is sheared and deformed. A large horizontal rigidity is generated by the restoring force due to the shear deformation of the anti-vibration rubber. In the second rubber deformation operation of the anti-vibration mechanism following the first rubber deformation operation, the top plate of the anti-vibration rubber comes into contact with the horizontal displacement stopper, and the shear deformation of the anti-vibration rubber is suppressed. At the same time, the through bolt becomes a cantilever with the bending rigidity of the anti-vibration rubber as the degree of rotation restraint at the contact position with the horizontal displacement stopper, and the through-bolt tilts (rotates) and the anti-vibration rubber is compressively deformed (bending deformation). Greater horizontal rigidity and rotational rigidity can be obtained.
Therefore, a rational arrangement of the anti-vibration rubber and the horizontal displacement stopper can ensure a large horizontal rigidity and rotational rigidity as the anti-vibration mechanism shifts from the first rubber deformation operation to the second rubber deformation operation. can. As a result, it is possible to reduce the amount of deformation of the ceiling structure in the horizontal direction during an earthquake while suppressing the vibration (sound) of the ceiling structure with the vibration isolation mechanism, which is a weak point of the acoustic environment. The clearance around (wall side) can be made smaller.

The second characteristic feature of the present invention, the clearance is formed between the inner surface and the outer surface of the through bolt of the bolt insertion holes of the vibration damping rubber, said anti-vibration mechanism, when the action of the horizontal force, The point is that the through bolt slides and moves in a vertical posture within the clearance range of the bolt insertion hole, and then shifts to the first rubber deformation operation.

According to the above configuration, when a horizontal force is applied, the through bolt slides in a vertical position within the clearance range of the bolt insertion hole before the first rubber deformation operation of the vibration isolation mechanism, but the slide movement is very small. Therefore, the effect on the horizontal fluctuation of the ceiling structure is extremely small. Rather, the clearance of the bolt insertion hole facilitates the tilting of the through bolt in the second rubber deformation operation of the vibration isolation mechanism, so that the vibration isolation rubber can be appropriately compressed and deformed from the tilting direction.

The third characteristic configuration according to the present invention is that the horizontal displacement stopper is formed with a horizontal displacement regulating hole having a shape similar to the circular contour shape of the top plate of the anti-vibration rubber.

According to the above configuration, regardless of which direction the top plate of the anti-vibration rubber moves in the horizontal direction, the top plate of the anti-vibration rubber surely contacts the inner surface of the horizontal displacement control hole of the horizontal displacement stopper. This omnidirectional horizontal displacement stopper can suppress any horizontal fluctuation of the ceiling structure during an earthquake.

Vertical section of the ceiling support structure of the building II-II line arrow view of FIG. Enlarged view of FIG. 2 in the X direction Enlarged view of FIG. 2 in the Y direction An exploded perspective view of the main part Behavior diagram of through bolts and anti-vibration rubber during an earthquake Stress transmission diagram of anti-vibration joint in Y direction Stress transmission diagram of anti-vibration joint in X direction

[First Embodiment]
FIGS. 1 and 2 show a ceiling support structure of a building having anti-vibration and sound insulation performance suitable for a music hall, a complex movie theater (cinex), a theater, or the like. In this ceiling support structure, the ceiling structure 30 is supported by the support portion 10 of the non-suspended structure which is connected to the skeleton 1 of the building and acts together with the skeleton 1. For convenience, the wide direction of the column span in FIG. 2 will be referred to as the X direction, and the narrow direction of the column span will be described as the Y direction.
As shown in FIGS. 1 and 2, in the building frame 1, a plurality of girders 3 are erected between a plurality of columns 2, a plurality of girders 4 are erected between the girders 3, and the girders 3 and small beams 3 are erected. An upper floor slab 5 is constructed on the upper side of the beam 4. A plurality of bundle members 11 extending downward in a vertical posture are arranged on the plurality of beam 4s at predetermined pitches in the X direction and the Y direction, and between each bundle member 11 and the beam 4 A beam (reinforcing material) 12 in each direction for strengthening the horizontal strength and rigidity of the bundle member 11 is erected in an oblique posture. The plurality of bundled members 11 and the square cane 12 form a support portion 10 having a non-suspended structure that behaves together with the skeleton 1.

As shown in FIGS. 3 to 5, each bundle 11 is made of H-shaped steel, and the lower end of both flanges 11A of each bundle 11 is longer than the outer dimension of the web between the outer surfaces of both flanges 11A. The horizontal bearing member 15 is attached in a substantially inverted "T" shape. Each upper receiving member 15 is made of channel steel arranged horizontally with an upper opening, and is applied to the outer surface of both flanges 11A of the bundled member 11 at the intermediate portion in the longitudinal direction of the recess of the upper receiving member 15. The pair of first connecting plates 16 to be formed are fixed by welding or the like. Both first connecting plates 16 of each upper receiving member 15 are fixedly connected to both flanges 11A of the bundle member 11 by first fasteners 17 such as bolts 17A and nuts 17B.

As shown in FIGS. 3 to 5, each of the plurality of bundled members 11 arranged at a predetermined pitch is arranged in a direction (X direction) orthogonal to the longitudinal direction (Y direction) of the beam 4. A plurality of underreceivers provided on a plurality of field edge receiving support beams (beam members) 31 on the ceiling structure 30 side arranged along each row across the upper receiving members 15 of the plurality of bundled members 11 in the row. The material 32 is attached.
Each field edge receiving support beam 31 is made of channel steel that is horizontally arranged with a lateral opening. Each of the underlaying members 32 has a horizontal underlaying plate 32A that is wider than the outer dimension of the web between the outer surfaces of both flanges 11A of the bundled lumber 11 and a vertical underside along the outer surface of the web 31B of the field edge receiving support beam 31. It is composed of a second connecting plate 32B fixed to the lower surface of the receiving plate 32A by welding or the like, and a reinforcing plate 32C fixed to the back surface of the second connecting plate 32B and the lower surface of the lower receiving plate 32A by welding or the like. The second connecting plate 32B of each lower receiving member 32 is fixedly connected to the web 31B of the field edge receiving support beam 31 by a second fastener 33 such as a bolt 33A and a nut 33B.

In the ceiling structure 30, as shown in FIG. 1, a plurality of first field edge receivers 35 orthogonal to the plurality of field edge receiver support beams 31 are arranged in parallel along the horizontal direction. A first field edge 37 provided with a sound insulating ceiling plate 36 is attached to the first field edge receiver 35. Further, a plurality of second field edge receivers 39 are arranged in parallel along the horizontal direction on the plurality of hangers 38 vertically hung from the first field edge receiver 35 below the sound insulation ceiling plate 36. .. A second field edge 41 provided with a sound absorbing ceiling plate 40 is attached to the second field edge receiver 39.

Then, as shown in FIGS. 3 to 5, anti-vibration mechanisms 20 are provided between each upper receiving member 15 on the support portion 10 side and each lower receiving member 32 on the ceiling structure 30 side corresponding thereto. ing. Each of the anti-vibration mechanisms 20 is configured as shown below.
As shown in FIG. 5, the upper surface of the web 15B of the upper receiving member 15 is on the outer side of both flanges 11A of the bundle member 11 and is equidistant from the center position of the web 11B of the bundle member 11 in the width direction. Cylindrical anti-vibration rubber 21 having a bolt insertion hole 21a penetrating through the center is arranged at each of the symmetrical positions. Bolt through holes 15a that communicate with the bolt insertion holes 21a of the anti-vibration rubber 21 in a concentric state are formed at two locations on the web 15B of the upper receiving material 15 corresponding to the bolt insertion holes 21a of the pair of anti-vibration rubbers 21. Has been done. Similarly, there are two bolt through holes in the lower receiving plate 32A of the lower receiving material 32 corresponding to the bolt insertion holes 21a of the pair of anti-vibration rubbers 21 that communicate with the bolt insertion holes 21a of the anti-vibration rubber 21 in a concentric state. 32a is formed.
A rubber plate 22 for sound insulation is arranged between the lower surface of the web 15B of the upper receiving material 15 and the upper surface of the lower receiving plate 32A of the lower receiving material 32, and at each of the portions corresponding to the pair of anti-vibration rubbers 21. It is installed. The pair of rubber plates 22 are formed with bolt through holes 15a of the upper receiving material 15 and bolt through holes 22a communicating with the bolt through holes 32a of the lower receiving material 32 in a concentric state.

Then, the bolt insertion holes 21a of the anti-vibration rubber 21 arranged vertically in a concentric state, the bolt through holes 15a of the upper receiving material 15, the bolt through holes 22a of the rubber plate 22, and the bolt through holes 32a of the lower receiving material 32. A through bolt 24 with a washer 23 is inserted from above, and a nut 25 is screwed into and fastened to the tip of the through bolt 24 protruding downward from the bolt through hole 32a of the lower receiving member 32.
In a state where a pair of anti-vibration rubbers 21 interposed between the web 15B of the upper receiving material 15 and the lower receiving plate 32A of the lower receiving material 32 are fastened with the through bolts 24, the vertical load on the ceiling structure 30 side is , The lower receiving material 32 → the through bolt 24 → the anti-vibration rubber 21 → the upper receiving material 15 → the bundle material 11 is transmitted in this order. The vibration-proof function of the vibration-proof rubber 21 can suppress the propagation of vibration (sound).

As shown in FIGS. 3 to 5, each of the portions of the flanges 15A of the upper receiving member 15 on the outer side of the flanges 11A of the bundle 11 is horizontal to the metal top plate 21A of the anti-vibration rubber 21. A horizontal displacement stopper 27 that can be contacted from the direction is provided. Each horizontal displacement stopper 27 is formed with a horizontal displacement regulating hole 27a having a shape similar to the circular contour shape of the top plate 21A of the anti-vibration rubber 21.
As shown in FIGS. 3, 4, and 6, between the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27 and the outer peripheral surface of the top plate 21A of the anti-vibration rubber 21, the anti-vibration rubber 21 An annular gap C1 at a set interval is formed in a state where the outer surface of the through bolt 24 is in contact with the inner surface of the bolt insertion hole 21a.

The anti-vibration mechanism 20 has a gap C1 formed between the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27 and the outer peripheral surface of the top plate 21A of the anti-vibration rubber 21. In the range until the top plate 21A of the anti-vibration rubber 21 comes into contact with the horizontal displacement stopper 27, the through bolt 24 slides in a vertical position to shear-deform the anti-vibration rubber 21 (FIG. 6 (FIG. 6). b)) and after the top plate 21A of the anti-vibration rubber 21 comes into contact with the horizontal displacement stopper 27, the through bolt 24 tilts to compress and deform the anti-vibration rubber 21 (FIG. 6 (FIG. 6). c) and) are configured to be feasible.

As shown in FIG. 6, the inner diameter of the bolt insertion hole 21a of the anti-vibration rubber 21 is configured to be slightly larger than the outer diameter of the through bolt 24, and the inner surface of the bolt insertion hole 21a of the anti-vibration rubber 21 and the outer surface of the through bolt 24. A clearance C2 is formed between the two. Therefore, the anti-vibration mechanism 20 slides and moves the through bolt 24 in the vertical posture within the range of the clearance C2 of the bolt insertion hole 21a when a horizontal force is applied, and then shifts to the above-mentioned first rubber deformation operation.

In the present embodiment, the gap C1 formed between the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27 and the outer peripheral surface of the top plate 21A of the anti-vibration rubber 21 is a bolt insertion of the anti-vibration rubber 21. The clearance between the inner surface of the hole 21a and the outer surface of the through bolt 24 is set to be larger than the clearance C2.

Next, an example of the anti-vibration mechanism 20 configured as described above will be described.
[Overview of anti-vibration rubber 21]
The basic physical property values (manufacturer catalog value, product name: YMDH-80 manufactured by Yakumo Co., Ltd.) of the anti-vibration rubber 21 are shown below.
Static spring constant = compression: 750 N / mm, shear: 100 N / mm
Regular load (loading load) = 1,500N to 3,500N
Allowable load = compression: 4,800N

[Mechanical characteristics in the vertical direction]
Since the vertical rigidity of the joint portion interposed with the anti-vibration rubber 21 is substantially the same as the catalog value of the anti-vibration rubber product, the vertical rigidity Kv of the joint portion is an elastic system to which the catalog value of the product is applied mutatis mutandis.
Kv = Fv (vertical force) / δv (vertical displacement)
= 750N / mm (catalog value) x 2 units = 1,500N / mm

Next, the behavior around the anti-vibration rubber 21 according to the horizontal force will be described in detail.
[Step 1]
[Horizontal mechanical properties]
As shown in FIG. 6A, when the horizontal force F1 is applied, the through bolt 24 slides in the clearance C2 of the bolt insertion hole 21a of the anti-vibration rubber 21 in a vertical posture.
At this time, there is a frictional resistance between the head portion 24a of the through bolt 24 and the top plate 21A of the anti-vibration rubber 21, but this frictional resistance is a minute and negligible value.
Since the hole diameter of the bolt insertion hole 21a of the anti-vibration rubber 21 is φ = 16 mm and the shaft diameter of the through bolt 24 is 12 mm, the standard value of the slide displacement amount δ1 of the through bolt 24 is ± 2 mm.
In this case, the horizontal rigidity of the anti-vibration rubber 21 is as follows.
Horizontal rigidity: KH0 = 0 [N / mm]
Deformation range: -2 mm to + 2 mm (standard)

[Step 2]
[Horizontal mechanical properties]
As shown in FIG. 6B, when a horizontal force F2 larger than the horizontal force F1 in step 1 is applied, the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27 and the top plate 21A of the anti-vibration rubber 21 The through bolt 24 is provided in the range until the top plate 21A of the anti-vibration rubber 21 comes into contact with the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27 due to the gap C1 formed between the outer peripheral surface and the horizontal displacement stopper 27. The first rubber deformation operation is executed in which the vibration-proof rubber 21 is shear-deformed by sliding and moving in the vertical posture.
In the deformation range of the gap C1 between the anti-vibration rubber 21 and the horizontal displacement stopper 27 at 3 mm, the shear deformation of the anti-vibration rubber 21 exhibits excellent restoring force characteristics.
The shear spring constant (catalog value) of the anti-vibration rubber 21 is used as a base value, and the correction coefficient α1 (1,25) is multiplied to compare with the test value.
In this case, the horizontal rigidity of the anti-vibration rubber 21 is as follows.
Horizontal rigidity: KH1 = α1 × 100N / mm (catalog value) × 2 units = α1 × 200 [N / mm]

[Step 3]
As shown in FIG. 6C, when a horizontal force F3 larger than the horizontal force F2 in step 2 is applied, the top plate 21A of the anti-vibration rubber 21 is the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27. The shear deformation of the anti-vibration rubber 21 is suppressed. At the same time, the through bolt 24 becomes a cantilever lever whose rotational rigidity is the bending rigidity of the anti-vibration rubber 21 at the stopper contact position, and the horizontal displacement according to the rotation (tilt) and bending deformation of the through bolt 24 under this situation. The second rubber deformation operation is executed.
The mechanical characteristics in the horizontal direction when the top plate 21A of the anti-vibration rubber 21 abuts on the inner peripheral surface of the horizontal displacement regulating hole 27a of the horizontal displacement stopper 27, and the rotation of the through bolt 24 under the above-mentioned cantilever condition. The mechanical characteristics in the rotation direction due to the bending deformation of the anti-vibration rubber 21 will be described.

[Horizontal mechanical properties]
Restoring force characteristics are set for horizontal displacement due to rotation and bending deformation of the through bolt 24 under the above-mentioned cantilever condition.
The specifications of the anti-vibration rubber 21 are as follows.
Effective ^{area: rAe = π (37 2 -8} 2) = 4,050mm 2
Effective moment of ^{inertia: rIe = π (74 4 -16} 4) / 4 = 23,499,430mm 4
Rubber thickness: rH = 34.5 mm (see Fig. 6 (a))
Kv: Vertical rigidity of the anti-vibration rubber 21.
Approximately calculating the apparent elastic modulus from the vertical rigidity,
rE = Kv · rH / rAe = 750 × 34.5 / 4,050 = 5.96N / mm ²
The flexural rigidity of the anti-vibration rubber 21 (per piece) is roughly calculated by the following formula.
rK = rE · rIe / rH = 5.96 × 23,499,430 / 34.5 = 4.06 × 10 ⁶ N · mm / rad

Now, as shown in FIG. 7, assuming that a unit horizontal force (H = 1.0N) is transmitted to the through bolt 24 on the upper surface of the lower receiving plate 32A of the lower receiving member 32 of the joint, it is assumed that the through bolt 24 has a unit horizontal force (H = 1.0N). The angle of rotation θ that occurs and the horizontal deformation δH at the beam center position of the field edge receiving support beam 31 that accompanies this are as follows.
M: Eccentric bending, rK: Flexural rigidity of anti-vibration rubber 21, H: Horizontal force, h1: Eccentric distance (50 mm) from the upper surface of the lower receiving plate 32A to the horizontal displacement stopper 27, h2: Field edge receiving support beam. The eccentric distance (132.5 mm) from the beam center position of 31 to the horizontal displacement stopper 27.
θ = M / rK = (H × h1) / (rK × 2 units)
δH = θ × h2 = (H × h1 × h2) / (rK × 2)
= (1.0 × 50 × 132.5) / (4.06 × 10 ⁶ × 2) = 8.159 × 10 ^-4

Since the bending deformation of the through bolt 24 was about 1/50 of the rotational deformation caused by the bending deformation of the anti-vibration rubber 21, this is ignored for the sake of simplicity.
Considering the correction coefficient α2 (1.25) for comparing with the test value for the horizontal displacement Δh with respect to the unit horizontal force (H = 1.0N), the following equation is obtained as the horizontal rigidity.
Horizontal rigidity: KH2 = α2 × H / δH = α2 × (1.0 / 8.159 × 10 ^-4 ) ≒ α2 × 1,200 [N / mm]

[Mechanical characteristics in the direction of rotation]
X direction (longitudinal direction of field edge receiving support beam 31)
In the X direction, as shown in FIG. 8, the load center of the horizontal force H is assumed to be the center of gravity of the first field edge receiver 35, and the distance from the center of gravity of the first field edge receiver 35 to the horizontal displacement stopper 27 is set. It is regarded as an eccentric distance h3 (217.5 mm).
The eccentric bending M is processed as a couple of the vibration-proof rubber positions arranged on both sides of the bundle member 11, and the rotation accompanying the deformation of the vibration-proof rubber 21 occurs in the lower frame including the field edge receiving support beam 31.
The relationship between each part is shown below when the horizontal force is H and the rotation angle generated in the lower frame by eccentric bending is θ.
In addition, rL: distance between cores of both anti-vibration rubber 21 (288 mm), Kv: vertical rigidity of anti-vibration rubber 21.
Eccentric bending acting on the support portion 10: M = H × h3
Couple acting on the anti-vibration rubber position: V = M / rL = H × h3 / rL
Vertical displacement amount of anti-vibration rubber 21: δv = V / Kv = H × h3 / (rL × Kv)
Rotation angle generated in the lower frame: θ = 2 × δv / rL = 2 × H × h3 / (rL ² × Kv)
The correction coefficient for comparing with the test value is α3 (1.00), and the rotational rigidity KRX of the joint in the X direction is obtained below.
X direction of the rotational stiffness: KRX = α3 × M / θ = α3 × (H × h3) / {2 × H × h3 / (rL 2 × Kv)}
= Α3 × rL ² × Kv / 2 = α3 × 288 ^{2 × 750/2
= Α3 × 3.110 × 10 7 →} α3 × 3.10 × 10 7 [N · mm / rad]

Y direction (direction orthogonal to the longitudinal direction of the field edge receiving support beam 31)
In the Y direction, the load center of the horizontal force is regarded as the center of the field edge receiving support beam 31, but the rotational rigidity is considered to be equivalent to the flexural rigidity rK of the anti-vibration rubber 21 calculated in the previous section regardless of the eccentric distance.
The correction coefficient for comparing with the test value is α4 (1.00), and the rotational rigidity KRY of the joint in the Y direction is obtained below.
Rotational rigidity in the Y direction: KRY = α4 × rK × 2 groups = α4 × [4.06 × 10 ⁶ ] × 2
= Α4 × 8.12 × 10 ⁶ → α4 × 8.10 × 10 ⁶ [N ・ mm / rad]

As described above, in the first rubber deformation operation of the anti-vibration mechanism 20, the shear deformation of the anti-vibration rubber 21 exhibits a large restoring force characteristic, and further, in the second rubber deformation operation of the anti-vibration mechanism 20, a high value is obtained. Since the horizontal rigidity and the rotational rigidity of the above can be obtained, the clearance around the ceiling structure 30 (wall side), which is a weak point of the acoustic environment, can be reduced. Moreover, by reducing the clearance, it is possible to adopt a simple detail that closes the clearance with an angle or the like.

[Other Embodiments]
(1) In the above-described embodiment, the anti-vibration rubber 21 is arranged on both sides of the bundle 11 on the upper surface of the web 15B of the upper receiving material 15, but the anti-vibration rubber 21 is arranged only on one side of the bundle 11. You may.
Further, the anti-vibration rubber 21 may be arranged at three or more places around the bundle material 11.

(2) In the above-described embodiment, the support portion 10 on the skeleton 1 side has a plurality of bundle members 11 and a square wand 12, but the present invention is not limited to this. The support portion 10 having a non-suspended structure that behaves together with the skeleton 1 may be used.

1 Frame 10 Support part 15 Upper receiving material 20 Anti-vibration mechanism 21 Anti-vibration rubber 21A Top plate 21a Bolt insertion hole 24 Through bolt 27 Horizontal displacement stopper 27a Horizontal displacement regulation hole 30 Ceiling structure 32 Under receiving material C1 Gap C2 Clearance

Claims (3)

In a ceiling support structure in which a ceiling structure is supported by a support portion of a non-suspended structure that is connected to the skeleton and behaves together with the skeleton.
A vibration-proof mechanism for transmitting a vertical load via a vibration-proof rubber is provided between the support portion and the ceiling structure, and the vibration-proof mechanism can be brought into contact with the vibration-proof rubber from the horizontal direction. A horizontal displacement stopper provided on the support side in the state is provided .
In the anti-vibration mechanism, the upper receiving material on the support portion side and the lower receiving material on the ceiling structure side are connected by a through bolt with the anti-vibration rubber interposed therebetween, and the top plate of the anti-vibration rubber and the said. A gap of the set interval is formed between the horizontal displacement stopper and the inner surface of the bolt insertion hole of the anti-vibration rubber in a state where the outer surface of the through bolt is in contact with the inner surface of the bolt insertion hole of the anti-vibration rubber. Within the range of the gap until the top plate comes into contact with the horizontal displacement stopper, the through bolt slides and moves in a vertical position to shear-deform the anti-vibration rubber, and the anti-vibration rubber. A ceiling support structure in which a second rubber deformation operation in which the through bolt tilts to compress and deform the anti-vibration rubber after the top plate comes into contact with the horizontal displacement stopper can be performed. A clearance is formed between the inner surface of the bolt insertion hole of the anti-vibration rubber and the outer surface of the through bolt. After sliding remains vertical posture range, ceiling support structure according to claim 1, wherein the shifts to operate the first rubber modified. The ceiling support structure according to claim 2, wherein the horizontal displacement stopper is formed with a horizontal displacement regulating hole having a shape similar to the circular contour shape of the top plate of the anti-vibration rubber.

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